RTTI + access control problem

[Jan Reimers]

I'm having trouble with RTTI and access  control.  B is a friend of
the whole A heirarchy.  I therefore expect that B is allowed to
to cast to a private base of A3.   Is this abug?  egcs version 971031.
  


g++ -o test14 test14.cc; test14
cast failed

//test14.cc---------------------------------------------------
#include <iostream.h>

class A1 {
 public:
        virtual void foo() {friend class B;};
};

class A2 : public virtual A1 {friend class B;};

class A3 : public virtual A1, private A2 {friend class B;};

class B
{
 public:
        B(A1* a) : itsA(dynamic_cast<A2*>(a)) {};
        A2* itsA;
};

int main()
{
        A1* a=new A3;
        B b(a);
        
        if (b.itsA) cout << "cast ok" << endl; else cout << "cast
failed" <<
endl;
        return 0;
}
//---------------------------------------------------------------------